Abstract
Poly (tetramethylene terephthalate) (4GT)-poly (tetramethylene oxide) (PTMO) block copolymer films were annealed at various temperatures ranging from 130-190°;C or drawn at 25°C with draw ratios ranging from 1.0-7.0. The morphological changes in these films have been investigated by x-ray diffraction. In the annealed sample systems, the long period (Lp) and the crystalline size (l_??_) increase with increasing annealing temperature (Ta). No triclinic β form of the 4GT crystals is observed in the drawn films in the experimental range of draw ratios, although triclinic α form of an unoriented 4GT homopolymer film was transformed into the triclinic form with a small elongation of the film. The microfibril model can be applied to the deformation process of this block copolymer. The small-angle x-ray scattering patterns of the relaxed samples show four point scattering diagrams. The microfibrils in the relaxed films may be rotated or bent by contraction forces of extended intermicrofibrilar-tie chains.
